Stone-sawing machine



(No Model.) 2 Sheets-Sheet 1/ W. A. SPRING & H. H. S'GOVILLE. j

STONE SAWING MACHINE.

No. 422,988. Patented Mar 11 1 890.

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(N0 Mode 1.) 2 Sheets-Sheet 2,

SPRING & H. H. SOOVILLE.

STONE SAWING- MACHINE.

Patented Mar. 11, 1890.

N. PETERS, PhmLiihonphM, Washingim, D-C.

UNITED STATES I PATENT OFFICE.

IVILLIAIWI A. SPRING, OF OIOERO, AND HIRAM H. SCOVILLE, OF CHICAGO,

' ILLINOIS.

STON E-SAWING MAC'HIN E.

SPECIFICATION forming part of Letters Patent No. 422,988, dated March11, 1890.

Application filed January 31, 1890- Serial No. 838,755. (No model.)

I T at whom it may concern.-

Be it known that We, IVILLIAM A. SPRING, residing in the town of Cicero,Cook county, Illinois, and HIRAM I-I. SOOVILLE, residing at Chicago,county of Cook, State of Illinois, and both citizens of the UnitedStates, have invented a new and useful Improvement in Stone-SawingMachines, of which the following is a specification, reference being badto the accompanying drawings, in which.

Figure 1 is an end elevation, and Fig. 2 is a vertical section at line 22 of Fig. 1.

This invention relates to stone-sawing 1nachines of the class shown inLetters Patent of the United States No. 24,478, dated J une 21, 1859,granted to A. T'. Merriman, in which a reciprocating saw-sash issupported from a vertically-adj ustable frame.

The object of this invention is to increase the period of operation ofthe stroke of the saws by providing improved means for supporting thesash, so as to give a rectilinear movement thereto during a large partof its stroke, which we accomplish as illustrated in the drawings, andas hereinafter described.

That which we claim as new will be set forth in the claim.

In the drawings, A represents the main frame of the machine, and B Bsliding heads supported upon screw-threaded rods a, which are secured inthe frame A, so that the heads 13 can be adjusted vertically on theframe A. This frame A may be of any desired dimensions.

0 represents a sash containinganumber of saws "b, which are strainedbetween the end pieces 0 of such sash. The sash O is reciprocated by apitman F driven by an engine or other driving-power.

The construction above described is shown in the patent above mentioned,and we do not claim it as any part of our invention; nor do we limit theapplication of our invention to such construction, as other means forsupporting and adjusting the sliding heads may be employed.

The sash O is supported at each end from the heads B by means of twopairs of bars D. The bars of each pair are of equal length. The severalpairs of bars Dare each arranged and connected in the same manner, andwe will therefore describe the construction and op eration of a singlepair. As shown in Fig. 2, at their lower ends the bars D are pivotallyattached to the sash O a distance apart, near their middle portions theycross each other, and at their upper ends they are pivotally attached torocking arms 6 on opposite sides of a shaft E, which shaft is supportedin bearings 011 the head or heads B. As shown at the left-hand side ofFig. 2, when the sash is in the middle of its stroke, the rocking arms ewill be parallel to said sash, and a point mid way between the points ofattachment of the bars D to said sash will be in the vertical line ofthe shaft E. As the sash is moved toward the end of its stroke the pointof attachment of one of the bars D will be moved toward the verticalline through the shaft E, and the arm to which such bar is attached willbe rocked upwardly, and the point of attachment of the other bar to thesash will be moved away from such vertical line and its arm 6 will berocked downwardly. The lengths of the arms 6 and bars D, and thedistance between the points of attachment of the bars D to the sash O,we proportion so that the rocking of the arms ewill compensate for theshortening and lengthening, respectively, of the distances between thepoints of attachment of the bars D tothe sash and the center of theshaft, which would result from the swinging of the bars D. This gives tothe sash a rectilinear movement for a limited stroke-that is, while therocking of the arms c compensates for the swinging of the bars D. Theposition which the parts will occupy at the end of the rectilinearstroke in the proportion shown is indicated by dotted lines at theleft-hand side of Fig. 2. When the stroke is increased beyond a certainpoint, the sash will be lifted sufliciently to allow sand to fall belowthe saws or blades b, as shown at the right of Fig. 2. The returnportion of the stroke to the position shown at the left in Fig. 2 willbe the reverse of that above described, and a continuation of the strokein the opposite direction and return from that indicated in dotted lineswill be the same as that already described. The sash will be lifted whenit has passed the limit of the rectilinear movement in the oppositedirection,

as before described. The sash. being thus supported and guided by thecross-bars D and rocking arms 6, is moved during a considerable portionof its stroke in both directions in a straight or right line, therebyincreasing the period of time or length of the operative stroke of thesaws or blades upon the stone, and consequently increasing theirefficiency.

In amachine which we have constructed the pivots on the arms 6 arelocated twelve inches apart, and the pivots on the sash-heads arelocated twenty inches apart, and the bars D are fifty-four inches inlength between the pivots. These are the best proportions for amedium-sized machine, and they give the saws or blades a straight orline stroke of about eight inches with a lift at each end. By

increasing the length of the arms ethe length of the rectilinearmovement can be increased.

The number of pairs of bars D may be varied.

WILLIAM A. SPRING.

' HIRAM H. SOOVILLE.

Witnesses:

HARRY T. JoNEs, ALBERT H. ADAMS.

That We claim'as new, and desire to secure I, d it I

